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NovaJet 500/630/700 Series Service Manual
MAINTENANCE
Maintenance 3-13
Stepper Motor Winding Resistance Check
RED
WIRE
7.2-8.0
ohms
7.2-8.0
ohms
Figure 3-8. Stepper Motor.
1. Disconnect the stepper motor connection from J1 on the MPWA.
2. Using a standard ohmmeter or multimeter, measure between
pins 1 (red wire) and 3.
3. The reading should indicate 7.2-8.0 ohms.
4. Continue by measuring between pins 4 and 6.
5. Reading should also indicate 7.2-8.0 ohms.
6. If either measurement is out of tolerance, replace the stepper
motor.